Power-excavator.



No. 884,439. PATENTED APR. 14, 1908. J B VWEBBER, JR POWER EXOAVA'TOR.

APPLICATION FILED JAN.15. 190B.

2 SHEETS-SHEET 1 s ml? 5% JOHN B. WEBBER, 111,01"

TOLEDO, OHIO, ASSIG OF TOLEDO, OHIO, A C

NOR TO THE VULGAN IRON WORKS COMPAlfr ORPORATION OF OHI POWER-EXCAVATOR.

To all whom. it may concern: Be it known that 1,Jom\' a citizen of the United States, residing at T- ledo, Lucas county, Ohio, have invented a new and useful Power-Excavator, of which the following is a. specification.

This invention relates to a power driven Working member and especialiy to the rapid, easy and economical handling thereof.

This invention has utility when embodied in an excavator wherein the disposal of the prime movers and the features of operation and control, notwithstamling the increased speed available, insure certain and positive 'action which ismost efficient.

Referring to the drawings: Figure 1 is an embodiment of the invention in a power shovel, the showing being a side elevation with the housing broken away; Fig. 2 is a fragmentary plan view of one of the prime B. WEBBER, Jr.

trons Fig. 3 is an elevation of automatic governing features for one of the prime movers; ig. 4 is a diagram showing the inter-relation of controller with the governing features of Fig. 3; andFig. 5 is a perspective view of scheme for release of boom swing when power is applied.

From a source of supply of power, as trolley Wire 1, conductor or line 2, extends to switch 3 on distributing board 4 in the vehicle or car 5. The power return from -the switch 3 is through line 6, herein shown as to ground through rail. On this board 4 are resistances 7, 8, 9, for the various prime movers, as well as fuses 10 in the leads to these prime movers.

hrough controller 11 the swing of the boom is brought about. Upon throwing the controller to sup ly power to swingthe boom, by means of sol enoid 12, core 13 is drawn therein to pull lever 14 having cam arm 15 Working on a rod against the resistance of spring 16 to force arms 17 apart and thereby move brake shoes 18 to release the shaft 19 of the prime mover. The power thus releasing the brake at once drives this reversile prime mover in the direction for which the controller is thrown, and through gear 2O upon intermediate shaft, actuates gear 21 on the drum shaft. From the drum extends flexible means 22 over guides 23, 24 to the movers with some of the controlling connece Specification of Letters Patent.

Application filed January 15, 1908. 7 Serial No. 410 891. T REJJ Patented April 14, 1 908.

Y -H oStnaD turn table 25of the boom 26. When the limit of throw desired is reached, power is shut off by controller 11, and the brake shoes 18 at once lock shaft 19 and hold the boom. hen not swinging, the boom is locked by brake shoes 18.

Controller 27 in the boom for prime mover 28, like controller 11, serves as a starting device and the prime mover is also reversible. The prime mover 28, as well as the other rime movers herein shown, is dead centeress, and so with but this single prime mover the many stoppings and startings may be made at any angular position and no difliculty experienced. The introduction of intermediate shaft 29 between prime mover 2S and gear 30, makes possible most accurate handling through directing member 31 of the working member 32, as considerable movement by the prime mover means but little travel of the digging member 32. As the prime mover is high speed, this feature still permits of most rapid handling.

To yieldingly brake when permitting the shovel 32 to move to or from the boom, and

to lock the handle 3] a ainst movement when l if desired, there is provided adjacent gear 30 a friction surface engaged by strap brake or band 33 actuated through linkage 34 from foot lever 35 adjacent operators station 36 on the boom.

Controller 37 is for prime mover P8 pi tally mounted on intermediate shaft 39 a. d yieldably )oised bysprings 40, that the trans mission of strains thereto from sudden variations of load may be cushioned and thus-save the prime mover.

By intermediate shaft'39 the gear 41 on the drum shaft is driven. Chain or cable way 42 extends from the drum to the boom pivot, in which travels the flexible means 43 over the boom to the dipper or shovel 32, that it may be pulled into the material banled n operation the digging member meets with widely varying resistance which affect its speed of operation as well as power consumption to overcome.

Controller 44, through link 45, bell crank lever 46 and linkage 47, serves through friction band 48 to clutch gear 41 to actuate the drum that flexible means 4-3 may be actuated.

By means of foot lever 49 and rock shaft 50- 69 breaks the the brake band 51 may be controlled to hold or release the drum engaged by the flexible means 43. l

Through link 52 and lever 53, clutch 54 may be thrown in to drive sprocket chain 55, and through wheel 56 and flexible connection 57 propel the vehicle or car 5.

Facing the SWillOlllJOtlItl 4 in the car 5 is switchboard 58 .having thereon governing and controlling features, including reversing and throttling solenoids 59, solenoid 60 connecting a switch to efl'ect starting of prime mover 38, and solenoid 61 to cut in the resistance at overloads and thus throttle power supply.

, Referring to Fig. 4: with controller lever 37 in mid position no power is supplied to rime mover 38, while movement toward dotted line position first connects contacts 62, 63 through solenoid 60 with main 2, and the power passing lower set of terminals at solenoids 64, 65, energizes solenoids 66, 67, that the series motor 38 may be connected for forward operation. That this current through. the solenoids may not be excessive resistance 68 is introduced, from which the current passes through lower terminals of resistance inserting or governing solenoids 69, 70, 71, 72, and by line 73 to return main 6. Further movement of the controller 37 to the dotted ine position shown in'Fig. 4, brings contact 74 in circuit, which through upper terminals of solenoid 66, line 75, resistance 76 to cut down the current energizes solenoid 69, the core therein rising and thus through line 78 cutting out portion 77 of the resistance 9. This movement 01 core of solenoid circuit through the lower terminals from resistance 68 to line 73, but as solenoid 67 is energized, this current by lint: 79 may by-pass through terminals thereon from resistance 66and by connection 86 reach line 7 3.

Additional movement of controller 37 will reach contact 81, which current is cut down by resistance 82 and which then through terrninals at solenoid 69 will energize solenoid 7t) and thus short through conductor 8?) to line 73 to cut out additional. resistance 9. Likewise from contact 84-, current through resistance 85, passing terminals at solenoid 76 to energize solenoid 71 shorts throughcondoctor 86 to cut out another section of resistance 19. 'lhc next contact reached in this forward movcmcnt of controller 3 is contact 87, l'rom which current through resistance 88, passes through terminals at. solenoid 71 to energize solcnoid 72 and thus by lead 89 cut out the balance of the resistance 9 when the prime mover is up to speed.

'lo reverse, the controller 37 is thrown from mid position to contact 90 instead oi- 63, serving to energize solenoids 64 and 65, instead of 66 and 67, to oppositely drive the motor 38. Further movement of controller 37 cuts out resistance as in forward driving. That current which flows to energize the solenoids 69, 70, 71, 72, passes to terminals at solenoid 61 before reaching return main 6. Solenoid 61 is in series with the prime mover 38, and whenever the power supplied exceeds that for which solenoid 61 is set to control, the core of this solenoid is raised to break the circuit through solenoids 69, 70, 71, 72, an the resistance 9 is all thus automatically cut in to throttle the power supplied, and thus not only avoid danger to the prime mover but also avoid undue drop on the line. The completion of circuit through the forward or reversing solenoids and line 73 permits energizing of solenoid 60 to out in the motor 38. Accordingly with the resistance 9 all cut in there is still power supplied, and as the work at the shovel eases up and the motor picks up speed, the resistances will successively and automatically be cut out. There are weight disks 91 placed on the solenoid cores 92, thus adjusting the action of the solenoids to the power supplv. This automatic governorcontroller device for prime mover 38 is also cll'ective' as a circuit breaker, while for the swing prime mover and prime mover 28 circuit breakers 93 and 94 are provided. All control of the propelling, the pulling of the shovel and swinging of the boom is within,

reach of operator at station 95,

in the disclosure features of driving with no dead center to overcome, of brake holding device for swing when not being turned, and of self-governing controller that the pull on the digging member is gaged with the rate of travel of the shovel, the power as adapted is electricity, direct current system being shown. In the governing of the pull on the digging member, when its speed is materially reduced, excess ivc power consumption is avoided, but the motor has its first speed current with a torque available to constantly and gradually urge ahead, and as the digging member encounters less resistance, the increasing speed is automatically taken care ol' by this throttling system of governing inter-connected with the controller.

What is claimed and it is desired to secure by liettcrs Patent is:

1. A power excavator comprising a digging member, a directing member therefor, rotatable means to actuate the directing member, a boom, and a dead-centerless prime movcr on the boom to actuate the means.

2. A power excavator comprising a vehicle, a digging member carried thereby, a prime mover lor thrusting the member, a prime mover l'or swinging the member, a power receiving and distributing board carricd by the vehicle, and a starting device for each prime mover.

herein of the various 3. A power excavator comprising a vehicle, a digging member carried thereby, 'a

prime mover for pullinglthe member, a prime mover for swinging t e member, a rime mover for thrusting the member, an connecting means for conducting power to and from the vehicle.

4. "A power excavator comprising a vehicle, a digging member, prime movers for operating the member, a power receiving and distributing board, and controllers for the prime movers by which the power is distributed.

5. A ower shovel having a boom, a dipper or slibvel provided with a handle mounted in the boom, a shaft geared to actuate the handle, a prime mover on the boom, and a second shaft between the prime mover and handle driving shaft. 1

6. A power excavator having a digging member, and a yieldably poised prime mover for operating the member. i

7. A vehicle having a boom, a working member carried by the boom, a prime mover for swinging the boom, a brake coa'cting to limit the swing of the boom, and connections automatically releasing the brake as power is supplied to the prime mover.

8. A power excavator comprising a boom, a digging member, a directing member for the digging member, a prime mover carried I by the boom for actuating the directing meniolding the directing '10. 'A power excavatorcomprising a digging member, a prime mover for actuating the member, and a controller for the prime mover including automatically operating governing means.

11. A power excavator comprising a digging member, a prime mover therefor, and an adjustable governor-controller susceptible to varying operation of the digging member.

12. An excavator comprising a digging member, a prime mover therefor, and a governing device responsive to preclude excess ive power consumption in t e prime mover by automatically and varyingy throttling the supply.

In testimony whereof I aiiix my signature in the presence of two witnesses.

J. 'B. WEBBE a, JR. Witnesses:

, M. W. PLATT,

GEO. E. KIRK. 

